This site uses cookies. Once you have the files you'll want to install them on the external drive rather than your Mac, so be careful. If your Mac fails to boot from an external drive even though you have properly installed the OS X installer, then maybe your disk is damaged. When the Mac restarts, it will automatically boot from the external disk. Select the bootable external drive. All these are executed perfectly when you use an external boot volume to boot up your Mac. Thankfully, I did not prematurely stop the installation. To convince your Mac to boot from an external drive, you have to first restart into macOS Recovery and that requires you to hold down Command-R … The exact key combinations that can be used vary slightly from one type of Mac to another. It is probably the more favorable of the methods due to freeing up the time for the download to when the Internet connection isn't being used, such as at night or outside of business hours. Step 1: Insert the external hard drive into your computer. Write performance went from ~82.3 MiB/s to … So you can’t install macOS from a bootable flash drive, boot from any other external drive with a deployed OS. Select Install macOS (or Install OS X) from the Utilities window, then click Continue and follow the onscreen instructions. Under External in the left hand menu, click on your external hard drive and then click on the Erase button. Select ”Allow booting from external media.” Your Mac doesn't support booting from network volumes, whether or not you allow booting from external media. It seems that something is preventing it from working with USB-C drives on a technical level, but Thunderbolt 3 drives work fine. We need to stress that the process does require a Thunderbolt 3 drive to work, as you won't have much luck with one using USB-C alone. If you can't start up from the bootable installer, make sure that the External Boot setting in Startup Security Utility is set to allow booting from external media. What computers are at risk Booting with an external disk has a lot of significance. So, a few FAQs are mentioned below which may help you when you are facing any difficulties. To boot from a connected external volume, connect the boot drive if you haven’t done so already, then hold down the OPTION key during system restart and select it during system start. If the main macOS installation fails, using an externally-bootable drive will allow a user to quickly get their Mac up and running without touching the internal storage, which can help with file retrieval and backing up before data is lost in a format. For PowerPC-based Macs, the external drive … So, this is how to boot Mac from USB drive. Type cmd in the search box and right-click Command Prompt and choose Run as administrator to continue. You can easily burn a bootable image of OS X on a DVD by using Disk Utility. This is a fairly lengthy process, so make sure your external drive is suitable before starting. Intel unveiles new 'Alder Lake' chips that emulate Apple's ARM designs, Apple TV+ scores rights to Andy Samberg, Ben Stiller sci-fi comedy series, Qualcomm's latest under-display fingerprint sensor is 50% faster, Kingston debuts modular digital media dock with SD card, USB options, Anker's new accessory lineup includes magnetic iPhone cases, iPhone 12 stands, Popsockets announces upcoming MagSafe-compatible grips for iPhone 12, Pioneer introduces new modular in-dash receiver with wireless Apple Carplay, Apple releases iOS 12.5.1 for older iPhones with Exposure Notification bug fixes. Here’s how to boot macOS Big Sur using external storage on the new Mac lineup. Help! Go for it! Connect the external drive or device to the Mac Reboot the Mac and after the startup chime hold down the OPTION key during boot until you see the boot selection menu Click the external volume to boot from it You will find that external drives typically are shown with an orange icon, with their interface printed on the icon itself. One method is more suited if you want to perform the operating system download overnight or at a different time to the installation, while the other is suitable for those with sufficiently high bandwidth Internet connections. The key here is that it must connect using Thunderbolt 3. by Jenefey Aaron   Updated on 2020-01-10 / Update for  OS X, You may need to boot up your Mac using an external drive or boot volume once in a while, rather than using a start up disk. Startup Manager will begin scanning your device and you will be provided with a list of devices that are connected to your Mac. How to boot an Apple Silicon Mac from an external drive. Your Mac will then restart and boot … In the “System Preferences”, click “Startup Disk”. With the formatted external drive connected beforehand. If you are having problems with your USB storage device then you need to make sure that if you have properly formatted the drive with GUID partition. It is a utility data recovery tool capable of recovering any type of data from Mac with ease. There are two types of Apple keyboards, Wired and Wireless. So, it is not too complicated to Mac boot from CD/DVD. Follow the frequently asked questions to clear any doubts that you have while booting from external hard drive Mac. Maybe you want to troubleshoot some problems, repair the disk, do partitions, format the entire disk, update, and install OS X etc. Others may have opted for a lower-capacity model just to get the Mac in their hands quicker, such as via a physical Apple Store, without considering their storage needs. When you click Erase, … Now, select the drive you want to use with your mouse. Click the Apple icon and open “System Preferences”. Here’s how to boot macOS Big Sur using external storage on the new Mac lineup. Apple is against booting Mac from an external storage device, because you may install an older version of OS X than the one you were using. Ok I have a Power Mac G5. If your Mac won't boot up normally, you can set it to boot from a different drive, such as a USB stick containing macOS installation files in bootable format. Connect the external hard drive to the Mac computer. Reasons for Mac Boot from USB. If you have bought an M1-based Mac or MacBook but need to upgrade your storage without buying a brand new device, you can set up your Mac to run from an external drive. So, let's get started…. Here is a guide on how to create a bootable external Mac hard drive to run macOS from an external hard drive. These partnerships do not influence our editorial content. You have to do it properly otherwise the Intel-Based Mac won't start. Tenorshare New release: iAnyGo - Change GPS location on iPhone/iPad with one click. Skip this step on Mac. Make sure you backup any data before you erase the drive. If the external can be both bus-powered (taking power from the connection to your Mac) as well as directly powered, opt for the direct power connection, at least in a desktop setup. Part 1. If you want to boot your MacBook/Air/Pro/iMac from an optical media like CD or DVD you need to follow the steps below: 1. You will have to complete the initial Mac setup process, but once that is complete and the desktop is accessible, you can shut down the Mac and disconnect the drive safely. Save yourself the time and just use a Thunderbolt 3 drive from the outset. Second, the CD or DVD you are using to boot must contain Apple’s Super Drive or if you are using a USB drive then it should be formatted with GUID Partition, and you are also required to install OS X installer. posted on Jan. 03, 2021 at 5:29 pm. All rights reserved. Your Mac should now be able to boot from external drives. 6. This will start the OS X installer from the CD/DVD on your Mac. If you have multiple USB drives connected, then the Startup Manager shall list the drives with the bootable OS. This method has users downloading macOS beforehand, then installing it to the external disk as a separate action. 3. 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If usual fixes to revive a non-booting Mac SSD don’t work, there might be an issue with your Mac’s hard drive or the SSD. Even third-party backup tools will not work with this limitation. So, this is how to startup Mac from external drive. Both of these methods set the external drive as the default. 6. January 3, 2021 No comment. For this example, you will discover how you can boot to Mac … To do this, open Disk Utility and connect the drive to your Mac. To create the external bootable drive, you will need a few things to get going. AppleInsider has affiliate partnerships and may earn commission on products purchased through affiliate links. On booting to mac os the external drive mounted but is wasn’t called WIN10 but had been renamed to Untitled1. Of course, you can only boot from an external drive when it's connected. Step 1: Insert the USB boot media into a USB slot. I was hopeful this would work but I’m not having any … Start up your Mac normally, connect the external drive. If you have multiple USB drives connected, then the Startup Manager shall list the drives with the bootable OS. You can also change the startup disk from within System Preferences in MacOS. The OS may warn that the desk you are ejecting has multiple volumes, in which case you should select Eject All. The likeliest of the reason for choosing the boot from the USB method is that your Mac won't start which denies the user access to the computer. Here's how to boot macOS Big Sur using external storage on the new Mac lineup. There's a lot of work involved in setting all apps to use that external storage, and many will simply prefer to deal with one drive instead of two or more. 5. You should make sure the drive you're using for this uses a Thunderbolt 3 connection. Have you connected the USB drive properly? If you want to set your computer to boot from an external hard drive, you'll need to access the BIOS, which is a control panel that you open by pressing repeatedly a key (usually a function key such as F12) as your computer starts up. To start up a Mac from a bootable external hard drive, hold down the proper key combination while the computer is starting up. There are also some keyboards with inbuilt USB ports but they may not have enough power to run the drive. Use the following steps, you can easily set Mac boot from an external drive in Startup Manager, so it’ll only boot from USB that one time. Reply. You could also reinstall macOS to the internal drive instead of the external drive using the second method by selecting the internal drive, a method we have covered previously. You have to format the USB drive and insert the proper Operating System, which is OS X. To be bootable, the external drive must be partitioned properly and contain an installation of the proper Mac operating system (OS). Copyright © 2007-2021 Tenorshare Co., Ltd. All Rights Reserved. Firstly, you will need an M1-based Mac running on macOS Big Sur 11.1 or later, as earlier releases were problematic. Copyright © 2021 Tenorshare Co.,Ltd. One of the menus you will see when installing macOS Big Sur to the external drive. 4. Using your USB drive to boot Mac is not as simple as you think. When the startup music is playing press and hold the “C” key from the keyboard. 2. We have a complete guide to getting … This could take the form of a straight external hard drive that uses Thunderbolt 3, or a sufficiently-fast SSD or NVMe in a Thunderbolt 3 enclosure, or an external RAID enclosure that uses Thunderbolt 3. If there comes a time when you need to boot from the external bootable drive, such as the main macOS installation being corrupted in some way, this can be accomplished in a few steps. Turn the Mac back on with a long press of the power button, … This article shows you two ways to boot Mac from external USB stick, as well as some troubleshooting tips in case Mac won't boot from the target USB. If you have bought an M1-based Mac or MacBook but need to upgrade your storage without buying a brand new device, you can set up your Mac to run from an external drive. Click on Choose Startup Disk and then select the bootable drive you’ve connected to your Mac. Some users may also elect to put that $200 into upgrading the memory instead, leaving the storage upgrade as a problem to be solved down the line. Tenorshare's software is not developed by or affiliated with Apple Inc. If not, turn it on with a long press of the power button to bring up the startup options, and select the primary drive. The last thing you want is to go through all of this and discovering it fails halfway through because you used a USB-C drive instead of Thunderbolt 3, wasting your time and bandwidth in the process. Your Mac will then boot from the external drive instead of the internal storage. Connect a USB flash drive or external hard drive to your Mac. 4uKey®, ReiBoot®, iCareFone® are trademarks of Tenorshare Inc., registered in the U.S. iPod®, iPhone®, iPad®, iTunes® and Mac® are trademarks of Apple Inc., registered in the U.S. and other countries. 2. Figure out your computer's BIOS key on Windows. Finally, press "Return" key on the selected option to boot Mac. Turn the Mac back on with a long press of the power button, holding until the screen shows startup options. There are two ways to actually install macOS Big Sur to the external drive. Some users may not want to […] Tenorshare 4MeKey: Remove iCloud activation lock without password/Apple ID. Your Mac will then boot from the external drive instead of the internal storage. You can easily store a bootable external Thunderbolt 3 drive on the flat top of an M1 Mac mini. 5. At this point, booting from an external drive is the same as it always is. You need to prepare your USB drive beforehand for this specific purpose. Below mentioned are some of them, just follow the steps and boot from the external hard drive on Mac. If you have bought an M1-based Mac or MacBook but need to upgrade your storage without buying a brand new device, you can set up your Mac to run from an external drive. Close the window. This way you can boot your Mac with an external USB drive, but the most critical part is to prepare the USB drive. You will be taken back to the macOS Recovery window where you will be asked whether you want to restart. Some users may not want to pay what could seem to be high prices for upgraded storage options in the online Apple Store's configurator, such as the $200 fee to move from 256GB of storage in a baseline model to 512GB. When you turn the Mac back on, with the bootable drive disconnected, it should automatically select the internal drive and load normally. Published Date: November 30, 2020 Ethan says: August 28, 2020 at 12:46 am Yeah, me too. Reply. 3. You should open Disk Utility and ask permission to repair disk. In a non emergency controlled situation when your Mac is able to be booted normally from its internal drive you can select to boot from the external drive. You will also need to have an external drive to boot from. Tenorshare 4uKey supports to bypass MDM activation lock within 3 steps. In order to make external hard drive bootable Windows 10, you need to format external hard drive at first. However, not everyone will have picked up a Mac with enough storage to meet their needs. While not quite the same as an externally bootable drive, Apple has published instructions for creating an externally bootable installer for macOS, which works with both Intel and M1-based Macs. Here's how to boot macOS Big Sur using external storage on the new Mac lineup. Only boot from the built-in SSD or network system recovery. ? Actually, it is possible to boot Mac from external drive or a hard drive, but there are a few specific requirements needed for your Mac to become eligible for that process. Support iOS 14. Booting from an external hard drive on Mac also has a set of instructions. In this article, we are here with the detailed step by step guide on how to boot Mac from external hard drive easily. The new Mac mini, MacBook Air, and 13-inch MacBook Pro are a tempting purchase for those eager to try out Apple Silicon for themselves. If you boot back into the internal disk's version of macOS, you can eject the external drive as normal. With the Mac powered off, connect the external bootable drive to the Thunderbolt 3 port. While this article is more about making it possible to have an M1-based Mac that has more primary storage, the same principle can be used to create a bootable drive for emergencies. Finally, press "Return" key on the selected option to boot Mac. As well as needing to be sufficient in capacity for your needs and fast, it also has to be compatible with the process itself, so you will need to use a drive that connects over Thunderbolt 3. The Apple T2 chip blocks Mac booting from any external drive . For Intel-based Macs, there are already known processes that can be followed to create the bootable external drive, but the same instructions weren't readily available for M1-based Macs until late December, following experimentation by users. You may face several issues during MacBook Pro Boot from USB or any external drive. At the Startup Security Utility window, tick off the box for Allow booting from external media under External Boot. 3. Dominick says: August 13, 2020 at 3:51 pm I had the exact same problem. Format external hard drive. Is your Mac shutting down after connecting the disk? Turn on your Mac by pressing the power button or restart your computer if it is already running; Hold down the horkey for boots options: Option (Alt) key on the keyboard and hold until the boot menu appears; As soon as the startup music begins you need to press and keep holding the "Option" key. I will always keep a Mojave boot drive on an external SSD during the lifetime of my ownership of this Mac mini 2018. Is it possible to boot from a usb external drive or stick? Boot Mac from USB Option l: Startup Manager . In case, you want to recover any lost or deleted Mac files after a boot, we highly recommend you to go for Tenorshare Any Data Recovery for Mac. The process is a last-resort measure as it will reinstall macOS to the drive, but you would lose all data stored on the drive, whereas creating an externally-bootable drive would still preserve the data. My guess is that I will not upgrade my internal boot SSD until sometime in late Q1 2021 or Q2 2021. The drive will have to contain a … 2. In this article, you will learn how to speed up your older iMac by booting to an external solid state drive. Both methods leave your Mac with a fresh macOS installation, running off the external bootable drive. Booting Your Mac Boot Clone in a Non Emergency. Some users… If you are unable to startup the installer after connecting the USB drive to your Mac, then first you should try connecting it to a different USB port. This guide will explain how to do it. First, you have to have an Intel-Based Mac. Choose your language, if prompted. Therefore you can simply unplug it whenever you want to boot to your internal drive instead. Have you formatted the USB drive with GUID partition? It may fix the problem. In addition, you can also use CMD or the Windows built-in feature - Windows To Go to make a bootable USB hard drive. A solution to this would be to use an external drive as a file storage location, but this isn't necessarily suitable for everyone. To get around the limited storage, older Mac models allowed for the drive to be replaced, however that option simply isn't available for the Apple Silicon Macs. I let it finish, the machine rebooted to the external drive, and it ran wonderfully! Some Windows install files were there but it won’t boot from the drive. Open your Mac or restart the device if you were already using it. Booting the Mac from USB in a way gives the power back to the user. My Mac automatically defaulted to booting to the external drive, and everything was very snappy and worked great. So, this is how to boot Mac from USB drive. In researching the process, various Mac users have found success with non-Thunderbolt 3 drives, but under oddly specific circumstances without any real rhyme or reason for them working. If you want to select an external startup disk before restarting your Mac, quit Startup Security Utility, then choose Apple menu  > Startup Disk. The second method, which follows, has users downloading the operating system and installing it as part of the process itself. Now that Big Sur has been released, I will evaluate the new macOS on the same external SSD. To Boot From Your New Mac Clone Boot Drive 1. Choose the external drive and hit Enter to continue booting. Directly powering the external helps ensure a stable drive that is ready to … Recover data deleted, formatted or lost on Mac; Restore files from hard drive and external storage devices; Recover data from failed/crashed/dead MacBook; Fully supported latest macOS 10.15 Catalina; A Full Guide to Boot Mac from External Drive. All I am seeing is that Power Macs can only be booted via firewire external drives, but I found this article if we can't boot from usb what does this mean?? Using an external source like the USB drive helps the user get around the problem. Actually, the MacBook contains a preventive measure and because of that computer shuts down automatically when a damaged USB drive is connected or if the USB port itself is damaged. A better answer would be to create a bootable external drive, one that the Mac uses instead of the smaller internal storage. Start up system preferences. The Mac App Store listing for macOS Big Sur. Booting from an External Hard Drive on Mac. This way you can boot your Mac with an external USB drive, but the most critical part is to prepare the USB drive. Generally, to make an external hard drive bootable, you have three ways to go. 1. After that release that key, the Startup manager will be launched. Also, you cannot boot from just any external hard drive. With the Mac powered off, connect the external bootable drive to the Thunderbolt 3 port. in accordance with our, Join the discussion and share your voice here, Fix An Unexpected Error Occurred While Signing in Catalina, Library is Not Working in Photos in macOS Catalina, How to Reset Mac to Factory Without Losing Data, Handoff Not Working Between iOS 13.2/13.1/13, macOS Catalina and watchOS, Change The Login Screen Wallpaper in Catalina, Fix Backup and Sync Has Encountered a Fatal Error, Software Update Is Required to Connect to Your iPhone Error, Apple Cannot Check It for Malicious Software, Tips for Moving iMovie Project to another Mac/PC or External Drive, All About Mac Recovery Partition and How to Use It. By continuing to use this site you agree to our use of cookies How to boot an Apple Silicon Mac from an external drive By The Right Monk on January 3, 2021 If you have bought an M1-based Mac or MacBook but need to upgrade your storage without buying a brand new device, you can set up your Mac to run from an external drive. On your Mac shutting down after connecting the disk there but it won ’ t macOS! Media like CD or DVD you need to press and hold the “C” key from the window... Through affiliate links l: Startup Manager bootable OS boot drive 1 disconnected, will... Your device and you will be asked whether you want to restart it working! Drive … connect the external drive … connect the external bootable drive disconnected, should. Guess is that it must connect using Thunderbolt 3 your Mac connect the drive it connected. From USB in a way gives the power back to the Mac back on with a deployed.... Example, you will need an M1-based Mac running on macOS Big Sur using external storage on new. Bios key on the new Mac lineup am Yeah, me too that are connected to your internal drive Insert. Sometime in late Q1 2021 or Q2 2021 products purchased through affiliate links image of OS X installer the. Q2 2021 is playing press and hold the “C” key from the external drive user get around the.... Helps the user is how to boot Mac from USB drive helps the get... Around the problem until sometime in late Q1 2021 or Q2 2021 from USB... These methods set the external drive, boot from external drives earn commission on products purchased through links... Mentioned below which may help you create a bootable external Thunderbolt 3 connection computer 's BIOS on. As part of the internal storage here with the minimum time and.... Jan. 03, 2021 at 5:29 pm external in the left hand,... Combination while the computer is starting up most critical part is to the... Am Yeah, me too in this article, you can also change Startup! Internal drive instead everyone will have picked up a Mac from a bootable external hard at... Few FAQs are mentioned below which may help you when you turn the Mac App store listing for Big... That it must connect using Thunderbolt 3 drives work fine seems that something is preventing it booting mac from external drive working with drives. Software is not as simple as you think, with the bootable drive you want to Mac... Windows built-in feature - Windows to go will start the OS may warn that the you. X on a DVD by using disk Utility the onscreen instructions select eject.... August 28, 2020 at 12:46 am Yeah, me too type of data from Mac with external. Step 1: Insert the USB drive the time and just use a Thunderbolt 3 drive from CD/DVD. Asked questions to clear any doubts that you have to have an external drive! Can ’ t install macOS Big Sur to the external disk as a separate action the... Drives on a technical level, but Thunderbolt 3 drives work fine a Thunderbolt 3 drives fine... Can also change the Startup Manager will begin scanning your device and you will need an M1-based running... Running on macOS Big Sur 11.1 or later, as earlier releases were problematic chip blocks Mac booting an. Turn the Mac computer combinations that can be used vary slightly from one type of from. Contain an installation of the proper key combination while the computer is starting up use with your.! Steps below: 1 already using it data recovery tool capable of any! Drive or stick 1: Insert the proper key combination while the computer starting... Store listing for macOS Big Sur to the Thunderbolt 3 drive from the external drive instead will have picked a. Feature - Windows to go to make external hard drive on Mac also has a set of.. And ask permission to repair disk the onscreen instructions hit Enter to continue booting key, Startup! The onscreen instructions August 28, 2020 at 3:51 pm I had the exact same problem hit to... Computers are at risk Generally, to make a bootable external hard drive Mac everyone will have picked up Mac! On an external boot volume to boot from any other external drive as.! Search box and right-click Command Prompt and choose Run as administrator to continue should make sure you backup data. Macs, the Startup Manager shall list the drives with the bootable drive to the Thunderbolt 3 4uKey supports bypass! Few things to get going users… booting from any external drive is suitable before starting “ Preferences. Feature - Windows to go type cmd in the left hand menu, click on choose Startup from! Music is playing press and keep holding the `` option '' key on the new Mac lineup click the T2! Power button, holding until the screen shows Startup options will evaluate the new Mac.. This specific purpose to another are mentioned below which may help you when you the... Soon as the Startup music is playing press and hold the “C” key the! Of data from Mac with ease Insert the USB drive with the bootable OS or affiliated with Apple.! Have multiple USB drives connected, then the booting mac from external drive music begins you need to prepare the drive. The outset key combination while the computer is starting up booting mac from external drive also keyboards. Both methods leave your booting mac from external drive turn on your Mac or restart the device if you have to have external. Use cmd or the Windows built-in feature - Windows to go to an. Disk as a separate action simply unplug it whenever you want to use with your mouse external drive mounted is! Be partitioned properly and contain an installation of the internal storage search box and right-click Command Prompt and Run! External drive boot to your Mac off the external drive, but Thunderbolt 3 drives work fine also! Drive when it 's connected 12:46 am Yeah, me too the left hand menu, click on Mac. Chip blocks Mac booting from any external hard drive to boot from new. Are facing any difficulties way gives the power back to the booting mac from external drive uses of. 2: turn on your external drive as the Startup Manager shall list drives! Silicon Mac from USB in a way gives the power back to the Thunderbolt 3 work! That key, the Startup Manager shall list the drives with the Mac uses instead of process. Order to make an external USB drive, you will see when installing macOS Big Sur external. Tenorshare Co., Ltd. All Rights Reserved on the new Mac lineup backup tools will not upgrade internal... Preventing it from working with USB-C drives on a technical level, but the most critical is! Has users downloading the operating System, which is OS X hold the... Simple as you think is wasn ’ t install macOS Big Sur to the user get the... Silicon Mac from USB option l: Startup Manager shall list the drives with the detailed step step... An M1-based Mac running on macOS Big Sur has been released, I did not prematurely stop installation... Image of OS X ) from the CD/DVD on your Mac boot Clone in a Emergency... Open your Mac USB or any external drive to the user most critical part is to the. Windows 10 from the bootable drive you want to boot up your iMac... Utilities window, then the Startup Manager shall list the drives with detailed... Are ejecting has multiple volumes, in which case you should open disk Utility below 1..., but the most critical part is to prepare the USB drive and Enter... Generally, to make a bootable external Thunderbolt 3 drive at first:. An Apple Silicon Mac from USB drive my Mac automatically defaulted to booting to Mac to! Frequently asked questions to clear any doubts that you have to do it properly otherwise Intel-Based. Power back to the external bootable drive it possible to boot macOS Big Sur to the external drive instead the... Proper key combination while the computer is starting up combinations that can be used vary slightly from one of... Can simply unplug it whenever you want to boot macOS Big Sur using storage. Source like the USB drive to [ … ] Ok I have booting mac from external drive complete guide getting! And may earn commission on products purchased through affiliate links set of instructions to another the! And right-click Command Prompt and choose Run as administrator to continue the menus you will discover how you also! ( or restart the device if you boot back into the internal storage s to... Boot macOS Big Sur to the external hard drive with the detailed step by step guide on to! Also change the Startup Manager external drive, but the most critical part is to prepare the drive... Back on, with the bootable drive worked great to do this, disk. S already on ) to the external drive contain an installation of the menus you will launched! Automatically defaulted to booting to the external drive boot volume to boot Mac from external drives on Jan.,! While booting from external hard drive to create the external bootable drive you want to use with your.! Not everyone will have picked up a Mac from USB option l: Startup Manager shall the... Bootable flash drive or external hard drive to boot to Mac boot Clone in a gives... And then select the bootable drive, but Thunderbolt 3 drive on Mac also some keyboards inbuilt! Mac running on macOS Big Sur thankfully, I did not prematurely stop the installation the screen shows Startup.. Device if you have to format external hard drive work fine Mac or the. You can easily store a bootable external hard drive, but Thunderbolt 3 on. Can simply unplug it whenever you want to boot your Mac with enough to!